c51单片机编程实例讲解 c51单片机编程入门( 二 ) _云知道

WriteDeviceAddress=0B10100000;
block=RomAddress/256;
RomAddress=RomAddress%256;
WriteDeviceAddress=WriteDeviceAddress|(block<<1);
i2cStart();
WriteByte_24LC16B(WriteDeviceAddress);
WriteByte_24LC16B((unsigned ｃｈａｒ)RomAddress);
WriteByte_24LC16B(Wdata);
i2cStop();
_delay(5500);
}
2、字节读操作
unsigned ｃｈａｒ ReadByte_24LC16B()
{
unsigned ｃｈａｒ bit_count,rbyte=0;
SDA=1;
SDA_CTRL=1;
_delay(10);
for(bit_count=8;bit_count!=0;bit_count–)
{
rbyte=rbyte<<1;
_delay(2);
SCL=1;
rbyte=rbyte|((unsigned ｃｈａｒ)(SDA));
_delay(2);
SCL=0;
_delay(2);
}
SDA_CTRL=0;
return(rbyte);
}
unsigned ｃｈａｒ Read_24LC16B(unsigned int RomAddress)
{
unsigned ｃｈａｒ output,block;
ReadDeviceAddress=0B10100001;
WriteDeviceAddress=0B10100000;
block=RomAddress/256;
RomAddress=RomAddress%256;
WriteDeviceAddress=WriteDeviceAddress|(block<<1);
ReadDeviceAddress=ReadDeviceAddress|(block<<1);
i2cStart();
WriteByte_24LC16B(WriteDeviceAddress);
WriteByte_24LC16B((unsigned ｃｈａｒ)RomAddress);
i2cStart();
WriteByte_24LC16B(ReadDeviceAddress);
output=ReadByte_24LC16B();
i2cNoAck_MCU();
i2cStop();
_delay(2000);
return(output);
}
3、页写操作
Wdata为输入数组的首地址，RomAddress为需要进行存储的地址，范围在0~2047之间，cnt为一次需要写入的字节个数，建议采用8的倍数的cnt，因为本函数不采用自动分页，不是8的倍数会在超出页写入最多的字节数之后覆盖掉原来的数。
void WritePage_24LC16B(unsigned ｃｈａｒ *Wdata,unsigned int RomAddress,unsigned ｃｈａｒ cnt)
{
unsigned ｃｈａｒ block;
WriteDeviceAddress=0B10100000;
block=RomAddress/256;
RomAddress=RomAddress%256;
WriteDeviceAddress=WriteDeviceAddress|(block<<1);
i2cStart();
WriteByte_24LC16B(WriteDeviceAddress);
WriteByte_24LC16B((unsigned ｃｈａｒ)RomAddress);
while(cnt–)
{
WriteByte_24LC16B(*Wdata++);
}
i2cStop();
}
注意:连续进行多页写操作，需要在WritePage_24LC16B函数后添加150μs以上的延迟，这段时间，24C02内部需要将数据存储到芯片内部。
例子:
D_buffer[8] = {1,2,3,4,5,6,7,8};
WritePage_24LC16B(D_buffer,0,8);
_delay(150); //延迟150μs以及以上
WritePage_24LC16B(D_buffer,8,8);
4、页读操作
void ReadPage_24LC16B(unsigned ｃｈａｒ *Rdata,unsigned int RomAddress,unsigned ｃｈａｒ cnt)
{
unsigned ｃｈａｒ block;
ReadDeviceAddress=0B10100001;
WriteDeviceAddress=0B10100000;
block=RomAddress/256;
RomAddress=RomAddress%256;
WriteDeviceAddress=WriteDeviceAddress|(block<<1);
ReadDeviceAddress=ReadDeviceAddress|(block<<1);
i2cStart();
WriteByte_24LC16B(WriteDeviceAddress);
WriteByte_24LC16B((unsigned ｃｈａｒ)RomAddress);
i2cStart();
WriteByte_24LC16B(ReadDeviceAddress);
while(cnt>1)
{
*Rdata++ = ReadByte_24LC16B();
cnt–;
i2cAck_MCU();//发送完读地址后，需要应答一下
}
*Rdata = https://www.jinnalai.com/fenxiang/ReadByte_24LC16B();
i2cNoAck_MCU();//读取最后一个字节需要非应答
i2cStop();
_delay(2000);
【c51单片机编程实例讲解 c51单片机编程入门】

c51单片机编程实例讲解 c51单片机编程入门( 二 )

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